Sedimentary record of water column trophic conditions and sediment carbon fluxes in a tropical water reservoir (Valle de Bravo, Mexico)

Carnero-Bravo, Vladislav; Merino–Ibarra, Martín; Ruiz-Fernández, Ana Carolina; Sanchez-Cabeza, Joan-Albert; Ghaleb, Bassam

doi:10.1007/s11356-014-3703-0

Cited by 26 publications

(16 citation statements)

References 46 publications

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“…Comparable patterns are found in nine Danish lakes (Fig. 4c), and although not corrected for sediment focusing, similar relative increases in OC burial have been reported from lakes in Mexico (threefold increase) and Germany (fourfold increase) in the modern period (Brothers et al 2013;Carnero-Bravo et al 2015). At Baldeggersee, Teranes and Bernasconi (2000), found an increase in OC burial rates, rising from 15 g C m 22 yr 21 pre-1960 to 103.5 g C m 22 yr 21 in 1995-1996.…”

Section: Quantifying Oc Burial Efficiencysupporting

confidence: 84%

The historical dependency of organic carbon burial efficiency

Radbourne

Ryves

Anderson

et al. 2017

Limnology & Oceanography

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Many studies have viewed lakes as quasi-static systems with regard to the rate of organic carbon (OC) burial, assuming that the dominant control on BE is sediment mineralization. However, in systems undergoing eutrophication or oligotrophication (i.e., altered nutrient loading), or climatic forcing, the changes in primary production will vary on both longer (> 10 yr) and shorter (seasonal) timescales, influencing the rate of OC accumulation and subsequent permanent burial. Here, we consider the extent to which permanent OC burial reflects changing production in a deep monomictic lake (Rostherne Mere, UK) that has been culturally eutrophied (present TP > 200 lg L 21 ), but has undergone recent reductions in nutrient loading. We compare multi-year dynamics of OC fluxes using sediment traps to longer-term burial rates estimated from two 210 Pbdated sediment cores. The recent sediment record demonstrates that most of the autochthonous OC is preserved ( 95% of OC captured in the deep trap and 86% of the NEP in the contemporary system), contrary to widely held assumptions that this more labile, algal-dominated OC component is not well preserved in lake sediments. A revised method for calculating BE for lakes which have undergone changes in primary productivity in recent decades is developed, which reduces some of problems inherent in existing approaches using historical sediment records averaged over the last 25-150 yr. We suggest that an appreciation of lakes in all biomes as ecosystems responding dynamically to recent human impact and climate change (for example) can improve up-scaled regional and global estimates of lake OC burial.

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Section: Quantifying Oc Burial Efficiencysupporting

confidence: 84%

The historical dependency of organic carbon burial efficiency

Radbourne

Ryves

Anderson

et al. 2017

Limnology & Oceanography

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“…In addtion, the influence of nutrient inputs on the enhancement of primary productivity needs to be taken into consideration for correctly evaluating the climate effects on primary productivity in reservoirs [ Carnero‐Bravo et al ., ]. In general, TP and TN concentrations show overall increasing trends toward to the surficial layers in the ZT and LA cores (Figure S6), whereas they are variable throughout the XFJ core.…”

Section: Discussionmentioning

confidence: 94%

“…However, their correlations with HI in the ZT, LA, and XFJ cores are weaker than the correlations of T 5 with HI (Table S2). Moreover, the TP and TN concentrations remained low level (mostly TP < 0.1 mg/g, TN < 0.4%) (Figure S6) during the past decades and are far smaller than those in sediments of other eutrophic reservoirs (TP: 0.3–0.83 mg/g, TN: 0.2–0.9% for Valle de Bravo Lake; TP: 0.55–0.99 mg/g for Qingcaosha reservoir) [ Carnero‐Bravo et al ., ; Jin et al ., ], suggesting the nutrient enrichment in ZT and LA cores either partially contributes to the productivity enhancement or is associated with climate change as the essential nutrient for algae growth. Thus, the nutrient input is not the key factor affecting the primary productivity in the three reservoirs.…”

Section: Discussionmentioning

confidence: 99%

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Relationship of polycyclic aromatic hydrocarbons with algae‐derived organic matter in sediment cores from a subtropical region

et al. 2015

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The influence of algae-derived organic matter (AOM) and climate warming on the historical record of polycyclic aromatic hydrocarbons (PAHs) in the subtropical reservoir sediments was investigated. The profiles of PAH concentrations and AOM contents at the eutrophic and meso-eutrophic reservoirs are significantly elevated and show good correlations with increasing mean air temperature during the past 60 years, suggesting that increasing temperature plays a significant role in increase of algal productivity and PAH deposition. Temperature-mediated AOM is suggested to enhance the deposition and accumulation of pyrogenic PAHs in the sediment cores, also implying an inaccurate estimation on the historical record for atmospheric deposition of PAHs in eutrophic and meso-eutrophic reservoirs. For an oligotrophic reservoir, PAHs decrease as the sediment depth decreases and are less significantly related to AOM. As the oligotrophic reservoir is phosphorus limited and its AOM is significantly oxidized, the effect of increasing temperature on AOM and PAHs is insignificant.

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“…Carbon burial rates have also been assessed in VB using sedimentary records and radiometric methods ( Carnero-Bravo et al, 2014 ). These authors found that C flux to the sediments increased significantly after 1991, rising from a previous average of 174 g C m −2 y −1 to an average of 250 g C m −2 y −1 ) between 1993 and 2005.…”

Section: Study Areamentioning

confidence: 99%

Metabolism in a deep hypertrophic aquatic ecosystem with high water-level fluctuations: a decade of records confirms sustained net heterotrophy

Bermejo

Merino–Ibarra

Valdespino-Castillo

et al. 2018

PeerJ

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Long-term and seasonal changes in production and respiration were surveyed in the Valle de Bravo reservoir, Mexico, in a period during which high water-level fluctuations occurred (2006–2015). We assessed the community metabolism through oxygen dynamics in this monomictic water-body affected by strong diurnal winds. The multiple-year data series allowed relationships with some environmental drivers to be identified, revealing that water level-fluctuations strongly influenced gross primary production and respiratory rates. Production and respiration changed mainly vertically, clearly in relation to light availability. Gross primary production ranged from 0.15 to 1.26 gO2 m−2 h−1, respiration rate from −0.13 to −0.83 gO2 m−2 h−1 and net primary production from −0.36 to 0.66 gO2 m−2 h −1 within the production layer, which had a mean depth of 5.9 m during the stratification periods and of 6.8 m during the circulations. The greater depth of the mixing layer allowed the consumption of oxygen below the production layer even during the stratifications, when it averaged 10.1 m. Respiration below the production layer ranged from −0.23 to −1.38 gO2 m−2 h−1. Vertically integrated metabolic rates (per unit area) showed their greatest variations at the intra-annual scale (stratification-circulation). Gross primary production and Secchi depth decreased as the mean water level decreased between stratification periods. VB is a highly productive ecosystem; its gross primary production averaged 3.60 gC m−2 d−1 during the 10 years sampled, a rate similar to that of hypertrophic systems. About 45% of this production, an annual average net carbon production of 599 g C m−2 year−1, was exported to the hypolimnion, but on the average 58% of this net production was recycled through respiration below the production layer. Overall, only 19% of the carbon fixed in VB is buried in the sediments. Total ecosystem respiration rates averaged −6.89 gC m−2 d−1 during 2006–2015, doubling the gross production rates. The reservoir as a whole exhibited a net heterotrophic balance continuously during the decade sampled, which means it has likely been a net carbon source, potentially releasing an average of 3.29 gC m−2 d−1 to the atmosphere. These results are in accordance with recent findings that tropical eutrophic aquatic ecosystems can be stronger carbon sources than would be extrapolated from temperate systems, and can help guide future reassessments on the contribution of tropical lakes and reservoirs to carbon cycles at the global scale. Respiration was positively correlated with temperature both for the stratification periods and among the circulations, suggesting that the contribution of C to the atmosphere may increase as the reservoirs and lakes warm up owing to climate change and as their water level is reduced through intensification of their use as water sources.

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Sedimentary record of water column trophic conditions and sediment carbon fluxes in a tropical water reservoir (Valle de Bravo, Mexico)

Cited by 26 publications

References 46 publications

The historical dependency of organic carbon burial efficiency

The historical dependency of organic carbon burial efficiency

Relationship of polycyclic aromatic hydrocarbons with algae‐derived organic matter in sediment cores from a subtropical region

Metabolism in a deep hypertrophic aquatic ecosystem with high water-level fluctuations: a decade of records confirms sustained net heterotrophy

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